1. Inflorescence of 2 racemes at end of a culm, sometimes with a third one below 2
Inflorescence of 1-many racemes along a common elongated axis 7
2. Spikelets c. 1.5 mm long *P. conjugatum (NSW NT WA QLD)
Spikelets 2.5-4.5 mm long 3
3. Upper glume finely pubescent *P. distichum (NSW VIC TAS SA WA QLD)
P. paspalodes
Upper glume glabrous 4
4. Rhizomatous; spikelet width ±2/3 length *P. notatum (NSW WA QLD)
Stoloniferous or tufted; spikelet width ±1/2 length 5
5. Plants tufted P. multinodum (QLD)
Plants stoloniferous 6
6. Racemes to 7.5cm long; spikelets 3-3.5mm long *P. vaginatum (NSW VIC NT SA WA QLD)
P. distichum auct.
Racemes to 11cm long; spikelets 4-4.5 mm long P. batianoffii (QLD)
7. Spikelets borne singly in 2 rows along raceme 8
Spikelets borne in pairs in 4 regular or irregular rows along raceme 11
8. Plants usually less than 1 m tall P. scrobiculatum (NSW NT WA QLD)
P. commersonii, P. orbiculare
Robust plant 1-2 m tall 9
9. Spikelets 1.7-2.6 mm long; inflorescence with 1 raceme *P. ciliatifolium (NSW)

Spikelets more than 3 mm long; inflorescence with at least 2 racemes

10. Spikelets ± 3.5mm long, glabrous; plants with 2-6 racemes P. multinodum (QLD)
Spikelets ± 4mm long, slightly hairy; plants with at least 13 racemes *P. fasiculatum (WA)
11. Spikelets less than 1.5 mm long *P. paniculatum (NSW QLD)
Spikelets 2-4 mm long 12
12. Fertile lemma brown, distinctly convex 13
Fertile lemma white to straw-coloured, gently convex 17
13. Spikelets 2-2.4 mm long *P. mandiocanum (NSW QLD)
Spikelets 2.5-3 mm long 14



Plants rhizomatous 15
Plants tufted, not rhizomatous 16
Spikelets loosely and sparsely hairy, without hairs concentrated along the margins; leaves to 3.5 mm wide *P. nicorae (NSW)
Spikelets with white hairs to 0.5 mm long, sometimes oncentrated along the margins; leaves 1.2-2 cm wide                                                                *P. regnelii (NSW)
16. Spikelets glabrous; fruit dark brown and shining *P. plicatulum (NT WA QLD)
Spikelets pubescent; fruit light brown, not shining *P. virgatum (QLD)
17. Spikelets fringed with long silky hairs 18
Spikelets without long silky hairs 19
18. Spikelets 3-4 mm long *P. dilatatum (NSW VIC TAS SA WA QLD)
Spikelets 2-3 mm long *P. urvillei (NSW VIC TAS WA QLD)
19. Rachis 2-3 mm wide P. longifolium (NSW NT QLD)
Rachis less than 1 mm wide 20
20. Spikelets 2-2.6 mm long *P. quadrifarium (NSW VIC QLD)
Spikelets 3-4 mm long *P. exaltatum (QLD)
P. arechavaletae

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith